Reluctant Brother Gives In To Sister

My sister isn’t feeling well. My mom asks me to take care of her. Well, she is feeling super hot and takes off all her clothes??? She won’t leave me alone!!! I ask her to stop trying to take off my underwear but she refuses!!! She just keeps playing with my cock until I can’t say no. We fuck and I can’t stop taking her from behind! I make her cum SO damn hard before I bust a nut all over her tiny ass!